Dean,
The S/42 marked barrel is a Nazi-era spare part, made between 1936-1939. The e/63 on the barrel is the mark of the inspector who inspected it, and the e/GW3 is probably the mark of the final inspector of the rebarreling modification. The e/Hakenkreuz is the late German Army power proof, dating the rebarreling to 1939 or later.
Costanzo's interpretation of the stamp should be considerd as out-dated speculation.
Other markings on this gun are equally interesting. The dove/WaA(number?) on the breechblock is an early Weimar-era Reichswehr power proof. The c/Ns on the left frame and receiver are commercial rework proofs.
It would be useful to see a picture of the top of the breechblock, and to know if there is a mark on the breechblock's right side. It might be instructive to see the full serial number on the front of the frame, including the letter suffix.
And Ed is right about full views. There does not appear to be a sear safety on this gun, is that correct?
--Dwight
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